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- /*
- * Tegra ACONNECT Bus Driver
- *
- * Copyright (C) 2016, NVIDIA CORPORATION. All rights reserved.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
- #include <linux/clk.h>
- #include <linux/module.h>
- #include <linux/of_platform.h>
- #include <linux/platform_device.h>
- #include <linux/pm_runtime.h>
- struct tegra_aconnect {
- struct clk *ape_clk;
- struct clk *apb2ape_clk;
- };
- static int tegra_aconnect_probe(struct platform_device *pdev)
- {
- struct tegra_aconnect *aconnect;
- if (!pdev->dev.of_node)
- return -EINVAL;
- aconnect = devm_kzalloc(&pdev->dev, sizeof(struct tegra_aconnect),
- GFP_KERNEL);
- if (!aconnect)
- return -ENOMEM;
- aconnect->ape_clk = devm_clk_get(&pdev->dev, "ape");
- if (IS_ERR(aconnect->ape_clk)) {
- dev_err(&pdev->dev, "Can't retrieve ape clock\n");
- return PTR_ERR(aconnect->ape_clk);
- }
- aconnect->apb2ape_clk = devm_clk_get(&pdev->dev, "apb2ape");
- if (IS_ERR(aconnect->apb2ape_clk)) {
- dev_err(&pdev->dev, "Can't retrieve apb2ape clock\n");
- return PTR_ERR(aconnect->apb2ape_clk);
- }
- dev_set_drvdata(&pdev->dev, aconnect);
- pm_runtime_enable(&pdev->dev);
- of_platform_populate(pdev->dev.of_node, NULL, NULL, &pdev->dev);
- dev_info(&pdev->dev, "Tegra ACONNECT bus registered\n");
- return 0;
- }
- static int tegra_aconnect_remove(struct platform_device *pdev)
- {
- pm_runtime_disable(&pdev->dev);
- return 0;
- }
- static int tegra_aconnect_runtime_resume(struct device *dev)
- {
- struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
- int ret;
- ret = clk_prepare_enable(aconnect->ape_clk);
- if (ret) {
- dev_err(dev, "ape clk_enable failed: %d\n", ret);
- return ret;
- }
- ret = clk_prepare_enable(aconnect->apb2ape_clk);
- if (ret) {
- clk_disable_unprepare(aconnect->ape_clk);
- dev_err(dev, "apb2ape clk_enable failed: %d\n", ret);
- return ret;
- }
- return 0;
- }
- static int tegra_aconnect_runtime_suspend(struct device *dev)
- {
- struct tegra_aconnect *aconnect = dev_get_drvdata(dev);
- clk_disable_unprepare(aconnect->ape_clk);
- clk_disable_unprepare(aconnect->apb2ape_clk);
- return 0;
- }
- static const struct dev_pm_ops tegra_aconnect_pm_ops = {
- SET_RUNTIME_PM_OPS(tegra_aconnect_runtime_suspend,
- tegra_aconnect_runtime_resume, NULL)
- SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
- pm_runtime_force_resume)
- };
- static const struct of_device_id tegra_aconnect_of_match[] = {
- { .compatible = "nvidia,tegra210-aconnect", },
- { }
- };
- MODULE_DEVICE_TABLE(of, tegra_aconnect_of_match);
- static struct platform_driver tegra_aconnect_driver = {
- .probe = tegra_aconnect_probe,
- .remove = tegra_aconnect_remove,
- .driver = {
- .name = "tegra-aconnect",
- .of_match_table = tegra_aconnect_of_match,
- .pm = &tegra_aconnect_pm_ops,
- },
- };
- module_platform_driver(tegra_aconnect_driver);
- MODULE_DESCRIPTION("NVIDIA Tegra ACONNECT Bus Driver");
- MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
- MODULE_LICENSE("GPL v2");
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